package com.juhui.common.core.utils;

import cn.hutool.core.convert.Convert;
import cn.hutool.extra.servlet.JakartaServletUtil;
import cn.hutool.http.HttpStatus;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.springframework.http.MediaType;
import org.springframework.util.LinkedCaseInsensitiveMap;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.io.IOException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * 客户端工具类
 *
 * @author melorogee
 */
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class ServletUtils extends JakartaServletUtil {

	/**
	 * 获取String参数
	 */
	public static String getParameter(String name) {
		return getRequest().getParameter(name);
	}

	/**
	 * 获取String参数
	 */
	public static String getParameter(String name, String defaultValue) {
		return Convert.toStr(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name) {
		return Convert.toInt(getRequest().getParameter(name));
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name, Integer defaultValue) {
		return Convert.toInt(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name) {
		return Convert.toBool(getRequest().getParameter(name));
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name, Boolean defaultValue) {
		return Convert.toBool(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request 请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String[]> getParams(ServletRequest request) {
		final Map<String, String[]> map = request.getParameterMap();
		return Collections.unmodifiableMap(map);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request 请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String> getParamMap(ServletRequest request) {
		Map<String, String> params = new HashMap<>();
		for (Map.Entry<String, String[]> entry : getParams(request).entrySet()) {
			params.put(entry.getKey(), StringUtils.join(entry.getValue(), StringUtils.SEPARATOR));
		}
		return params;
	}

	/**
	 * 获取request
	 */
	public static HttpServletRequest getRequest() {
		try {
			return getRequestAttributes().getRequest();
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 获取response
	 */
	public static HttpServletResponse getResponse() {
		try {
			return getRequestAttributes().getResponse();
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 获取session
	 */
	public static HttpSession getSession() {
		return getRequest().getSession();
	}

	public static ServletRequestAttributes getRequestAttributes() {
		try {
			RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
			return (ServletRequestAttributes) attributes;
		} catch (Exception e) {
			return null;
		}
	}

	public static String getHeader(HttpServletRequest request, String name) {
		String value = request.getHeader(name);
		if (StringUtils.isEmpty(value)) {
			return StringUtils.EMPTY;
		}
		return urlDecode(value);
	}

	public static Map<String, String> getHeaders(HttpServletRequest request) {
		Map<String, String> map = new LinkedCaseInsensitiveMap<>();
		Enumeration<String> enumeration = request.getHeaderNames();
		if (enumeration != null) {
			while (enumeration.hasMoreElements()) {
				String key = enumeration.nextElement();
				String value = request.getHeader(key);
				map.put(key, value);
			}
		}
		return map;
	}

	/**
	 * 将字符串渲染到客户端
	 *
	 * @param response 渲染对象
	 * @param string   待渲染的字符串
	 */
	public static void renderString(HttpServletResponse response, String string) {
		try {
			response.setStatus(HttpStatus.HTTP_OK);
			response.setContentType(MediaType.APPLICATION_JSON_VALUE);
			response.setCharacterEncoding(StandardCharsets.UTF_8.toString());
			response.getWriter().print(string);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 是否是Ajax异步请求
	 *
	 * @param request
	 */
	public static boolean isAjaxRequest(HttpServletRequest request) {

		String accept = request.getHeader("accept");
		if (accept != null && accept.contains(MediaType.APPLICATION_JSON_VALUE)) {
			return true;
		}

		String xRequestedWith = request.getHeader("X-Requested-With");
		if (xRequestedWith != null && xRequestedWith.contains("XMLHttpRequest")) {
			return true;
		}

		String uri = request.getRequestURI();
		if (StringUtils.equalsAnyIgnoreCase(uri, ".json", ".xml")) {
			return true;
		}

		String ajax = request.getParameter("__ajax");
		return StringUtils.equalsAnyIgnoreCase(ajax, "json", "xml");
	}

	public static String getClientIP() {
		return getClientIP(getRequest());
	}

	/**
	 * 内容编码
	 *
	 * @param str 内容
	 * @return 编码后的内容
	 */
	public static String urlEncode(String str) {
		return URLEncoder.encode(str, StandardCharsets.UTF_8);
	}

	/**
	 * 内容解码
	 *
	 * @param str 内容
	 * @return 解码后的内容
	 */
	public static String urlDecode(String str) {
		return URLDecoder.decode(str, StandardCharsets.UTF_8);
	}

}
